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Most Recent Articles
Optical Dish Carving
Optical dishes are concave facets used in fantasy-cut gems. Learn this optical dish carving technique for creating your own unique gemstone designs.…
Gemstone Color Change Phenomena
Why do certain gems change color under different lights? Explore gemstone color change phenomena and the difference between natural and artificial…
What is Gemstone Luster?
Gemstone luster describes how a gem’s surface looks when it reflects light. Learn the common terms gemologists use for this property and what can…
How to Cut a Fantasy Gemstone
Curious about cutting a fantasy gemstone? This beginner’s guide will walk you through the steps and show you the tools and techniques you’ll need.…
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Encyclopedia has information on over 300 gemstones, from traditional and popular jewelry standards to collector’s stones that rarely appear for sale. Each entry has photos and detailed information about the gem’s properties. Entries for jewelry stones also have price guidelines and discussions of their most important value factors.
has been synonymous with the color green since ancient times. A fine emerald is a truly breathtaking sight, and this member of the beryl family deserves its placement among the traditional “Big Four” gems along with diamond, ruby, and sapphire.
For millennia, artisans have carved intricate cameos from black-and-white onyx
. Solid black onyxes, faceted or cabbed, are also popular jewelry stones.
Few gems have held our attention over millennia as well as
sapphire. The pure blue colors and excellent durability of this gem-quality member of the corundum family make for an exceptional gemstone. However, not all sapphires are blue. The September birthstone comes in every color of the rainbow (except red).
When it comes to engagement ring stones, there’s a lot to consider. In the moissanite
vs diamond debate, we’ll look at three main factors: beauty, durability, and price.
has a long history of use as a pigment. As a gemstone, this material is often carved but very rarely faceted. Despite its association with blood and the color red, hematite’s color can range from black and metallic gray to brownish red in thin slivers or crystals.
We’ve compiled information on average costs and sizes for different diamond cuts
and shapes at different carat weights. Learn how the different fancy cuts compare, and the pros and cons of different diamond cuts.
An olive to bottle-green natural glass, moldavite
is a rare material popular with collectors of unusual gems as well as those interested in its formation from a meteorite impact.
is the most common form of natural glass and occurs in many attractive varieties. Since prehistoric times, people have used this material to make jewelry and carvings as well as practical objects, like knives.